Метрологія та прилади (Jul 2017)
Investigation of Ultrasonic Flowmeter Error in Conditions of Distortion of Flow Structure Using One Peak Functions Salami
Abstract
Paper is devoted to the issue of improve the accuracy of flow measurement ultrasonic flowmeters in conditions other than the conditions of their calibration. In the introductory part the authors actualized high sensitivity of ultrasonic flowmeters to distortions of flow structure and proposed reduce the additional error that arises while by increasing the number of acoustic paths. To determine the minimum number of chordal acoustic paths ultrasonic flowmeters proposed use computer simulations using empirically-derived analytical functions distorted flow velocity of professor L.A. Salami [2]. Analysing the scientific and technical sources [3—11], the authors proposed a number of completions to fuller use of one peak functions of professor L.A. Salami in determining the minimum number of acoustic paths ultrasonic flowmeters. The main part of the article the authors initially calculated location coordinates and weights chordal acoustic paths ultrasonic flowmeters (Table 1) for the four most common methods [13]. Then, based on mathematical apparatus functions Salami (2—5, 9) and the principles of flow measurement multi-paths ultrasonic flowmeters (1) developed a method of estimation of additional error due to distortion of the flow structure. At that, in method first proposed to determine the calibration factor ultrasonic flowmeters (6) using undistorted component functions Salami (3). Using developed method and one peak functions Salami (Table 2) authors determined the required minimum number of acoustic paths ultrasonic flowmeters that investigated further reduce the error limits to regulated standards (10).
